So Ive had the issue of water getting through into the floor for sometime...surely it must be rust in the plenum!

But ive just had the thought that maybe its just water getting in between the window and the metal trim (?) as there is room. Im guessing this will follow on through to the interior floor? Or could it just be that theres still rust holes in the chamber and the water has access via this gap?

Why is there a gap there? Do i need to get some sort of rubber seal for it? I cant find any specific seals for front windows or windscreens though?